2. Box: The online filing sharing company is poised to go public on Friday after a number of false starts. But Box recently revealed it suffered a $170 million loss in its latest year of results.

3. Twitter: More than a year after its much-hyped IPO, Twitter(TWTR) is still posting huge losses. The social network has failed to reach the must-have status that Facebook(FB) landed years ago.

4. Zynga: The fact Zynga(ZNGA) is trading roughly 75% below its 2011 IPO price shows just how hard it is to consistently churn out mobile games people actually want to play.

5. Instagram: Facebook acquired Instagram for $1 billion back in 2012, but analysts say the photo-sharing app is unlikely to be profitable. Yet it could soon be in the black as users continue to flock to the service and advertisers start to latch on too.

6. Amazon.com: Jeff Bezos has driven Amazon(AMZN) investors crazy by investing so heavily in the company (see: drone delivery) that profits are wiped out. Yet it's tough to argue with Amazon's track record given its $138 billion market valuation.